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At the beginning of combat on your turn, populate. The token created this way gains haste. Sacrifice it at the beginning of the next end step. (To populate, create a token that's a copy of a creature token you control.)
Any “as [this creature] enters the battlefield” or “[this creature] enters the battlefield with” abilities of the new token will work.
If you choose to copy a creature token that's a copy of another creature, the new creature token will copy the characteristics of whatever the original token is copying.
If you control no creature tokens when you populate, nothing will happen.
The new creature token copies the characteristics of the original token as determined by the effect that put the original token onto the battlefield or by the characteristics of the copied permanent spell that became that token.
The new token doesn't copy whether the original token is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any noncopy effects that have changed its power, toughness, color, and so on.
